Cphthalmic trial frame



June 23, 193.1. CLEMENT 1,811,349

OPHTHALMIC TRIAL FRAME Jne23l93L l H CLEMENT L81L349 OPHTHALMIC TRIAL FRAME Filed Jan. 4, 1927 2 Sheets-Sheet 2 ATTORNEYS DU l VPatented kJune 23, 17931 Partnr orties g.

ran-s c rilnyrsnr, or nav( Yonai, n. Y., assigner; ro ennnnar. orrroar. oo., me., a

' l CORPOR'ATQN 0:7 NEW YCRJK CPHT-ILMIC TRIAL FRAME Application filed January 4, 132

Harem-fer@ .C.Olisdeiable trouble has been had, with trial frames in various respects and particularly as to maintaining the axes of the trial case lenses inaccurate alignment. This latter difficulty has been dueto a plurality of causes, manyinstances Several or all ef which are. l objectionably present. Chief among these causes have been `a lack of proper rigidity or Y stiffness 'parts of the frame should beA rigid, the subjection of such frame parts to distorting and bending strains when the trial frame is fitted to the head, and also, there has generally been objectionable looseness in slidablyguiding the'trial case lens holders on the main frame part for pupillaryadjustment, thereby permitting angular movementof the lensholders which destroys the axiall alignment of the lenses, Further- 1norethese trial frames have in many cases been uncomfortable to the patient, inconvenient to Qperate, and Vfatigu ingr to the patient, and have unduly consumed the time of the operator and have rendered accurate tests Clim-Cult.'

rlmong the objects of this invent-ion is to provide an improved trial frame'which will be free from the above noted objections.

Hence among the .objects of the invention are to provide a trial frame which will be comfortable to the patient, yWhich Will-have rigidity. the partsthat should be rigid While atthe same time providing sulticient resilience in .other parts .that should ybe more or less flexible and resilient, the various adjustments y oflivhich may be made quickly and accurately,

which Will'be convenient for the operator to adjust and operate, Which vvlll not fatigue the pa `rent during the tests, .which fill. be ot a su.-

perior mechanical construction'. throughout,

and by which the making of accurate tests is.

facilitated. Other objects are lightness in Weight, inexpensiveness of manufacture with. out sacrificing quality, facility in manufacturing, and the production of a .trial frame which will meet all practical requirements. Other objects and advantages of the invention will hereinafter appear.

The invention includes various features of construction and lcombinations' of parts as will appear Afrom the following description.

Serial No. 53,3451.

The embodiment of theinvention shown in the accompanying drawings will now be described and thereafter. the invention will be pointed out in claims, reference nov.' being had to the drawings, in which:

Fig. l lisa front elevation of a complete trial frame embodying the invention;

` Fig. 2 is a yplanview of the saine;

ligj?) is a side elevationV of the same as vic-Wed from the rightA of -l Withthe rear end portions or the temples brolen away to save space on vthe drawings;

Fig'. l is an enlarged rear elevation of the main frame part together with immediate adiuncts and parts, the rear cover plate being removed, otherparts being in vertical section and other parts broken away;

F 5 is a vertical section on the line 5 5 of Fig. il with some parts appearing in elevation;

Fig. 6 is a vertical section on the line 6-6 of 4;

Fig. 7 is an enlarged velevation from the inner side and partly broken away, showing the pivotal connection of the temple at thatV side to the temple arm;

l Fig. 8 is a horizontal-section on the line S-8 of Fig. 7 g

Fig. 9 is a section in a vertical plane taken on the horizontal line 9-9 of Fig. 8;

Fig.; l0 a side elevation from its inner side of va spring detent disc employed in connection with the horizontal pivot of the temple and which similarly appears in part in Fig. 7;

Fig. All is a horizontal section on the line lli-l1 of Fig'. 10, and shows the spring detent disc as it appears in Fig. 8;

F l2 is a further enlarged vertical section on the line l2-12 of Fig. 4;

Fig'. 13 is view similar to Fig. 7 but shows a modified construction of the horizontal pivot the temple, and is partly in section in a vertical plane taken on the horizontal line lil- 17.3 of Fig. 14; and

Fig. la is a horizontal section on the line 14x-i4 of Fig. is.

The construction of the trial frame shown in the drawings as an embodiment of the invention will now be particularly described.

A straightrrigid` channel-shaped cross bar 1 forming a main frame part has upper and lower flanges directed rearwardly of which the lower flange is cutaway or has ya portion omitted to'form a longitudinal slot 2 which extends throughthe major part of the length of the'bar. i This cross bar may be made from a suitable metal such as duralumin. At the middle of the length of thecross bar 1 a ,cene ter block or anchor block 3 of generally rectangular shape'iits closely in the channel of the cross bar 1 iiushwith its upper flange and extends downward through the slot 2 where it is notched both aroundand into the lower iange, as is perhaps shown niost'clearly in Fig. 5.V Thiszmiddl'e block is firmly secured lin place by means kcfay pairv of front screws as shown in Fig. land a pair of top screws las shown in Fig. 2, some of these screws also l so" Y jacent the closure plate 5.

appearing in dotted lines in Fig. 5.' It will be noted that this blocl; 3 is thus held against any movement whatever in anyzdirection relatively to the cross bar 11 End blocks4 closely fit in and close the ends-of the channel in j the bar 1 youtwardly from and flush with the ends of the slotf2, and each of these end blocks is firmly and yrigidly secured in place by means of a pair of frontscrews as shown in Fig. 1. A flat rear cover plate 5 closes the channel of the bar 1 with the exception of its slot 2vand is firmly and rigidly secured in place thereon by means of three pairs of screws entering respectively the center block 3 and the end blocks 4,' as is indicated by the screw holes shown in Fig. 4. It will-be noted thatthe -co'v'er plate 5 virtually or in effect forms a component part of the cross bar 1 so that it reinforces the latter to increase its strengthand rigidity and forms therewith a tubular bar of rectangular cross section havingvthe slot 2 along the bottom thereof ad- `The cover plate ,or Hat strip 5 is continuedl outwardly at its opposite ends to form in one l as piece therewith and as extensions thereof a pair of'temple arms which extend on graduallj7 merging curved lines outwardly and rear'- wardly and downwardlyin substantial conformation with the shape 'of the head of the patient, these temple arms being of a rounded and assists in supporting they cross bar or. main frame bar 1 together with the several parts mounted on or carried thereby. Stainless steel has been found a suitable material for this temple yoke, which, as above'noted, comprises the cross piece 5 and the temple arms 6 which form outward continuations or extensions thereof.

A temple 7 Vis connected to lthe free Yend portion 6a of each of the temple arms 16 through a double pivot or universal joint connection including avertica-l pivot and a horizontal transverse pivot, in the construction shown in the drawings the temple 7 having its horizontal pivot upon an interposed pivot block 8 which has a vertical vpivot for the ltemple on the end 6a of the temple arm 6. The pivot block 8 at its'top ishorizontallyp bifurcated at itsinner sid'etov receive the end 6a of the temple arm' together with a fric'-` tion washer 9, and a terminally screw threaded shouldered pivot stud orpi-votscrew 10 forms the vertical`pivot, and screws at vits lower end into the lowerfpart of'jthe bifurcated pivot block 8,-this pivot screw 1Q exert-v ing sufficient l.clamping action tojprevent any' undesirable looseness 'at this pivotal connec-v tion. f'

The lower part'of the'pivot bloclrl is' of circular flanged or Acup shape, -as Vshown vin Figs. 7 and 8, with its flanged side directed inwardly. The temple 7 is provided witha circular flat head y11 the inner side of which is shouldered to form a circular boss'which fits vsnugly within the rim of the cup formed bythe pivot block 9 Vfor pivotal movement. therein. shouldered `terminally screw threaded pivot stud 12 pivotally passes centrally through the bottom ofthe cup of the rpivot block 8 `and is countersunlt in and screws into thetemple head 11. In the drawings, for simplicity of illustration, the temple headll is shown as formed in one solid piece but obviously if sojdesired for manufacturing reasons thelouter parts thereof maybe formed as a hollow Vshell in one piece with the 'temple 7 while the inner part vof this head 11, including the boss formed thereon, may be a sepa.- rate 'piece set intothe 'shell and irmly retained'in vplace vtherein in any `convenient .way

Vsuch as bymeans of solder or otherwise.

5 The-extent of the angularV movement permittedof the temple arm 6 onthe temple 7,;is positively limited to the desired arc by means of cooperating stops shownas an arcuate slot 13 in the inner face of the templehead 11 and aI stop pin 14 rigidly carried by the cup of the pivot block 8 and projecting into 4this slot, as shownin Figs-7, 8 and 9.. It will be noted that .an annular space is provided be-y tween the inner face of the boss'on the templel head 11 and the inner face of the bottom of the cup of the pivot block 8, and within this annular space there is .provided a frictiondevice in control .ofthel rocking or tilting move- Y ment of the temple armiG on the temple 7,V such device most desirably being an auto- Sil iii)

iro'ectinfr into the interveninff s nace from the bottom of the pivot block cup by which it is rigidly carried. This spring detent disc 15V. is bent or indentedto form a `V-shaped diametral Vridge 17 which may snap into and yieldingly engage in either one of a pair of diametral crossed grooves 18 shown as provided in the adjacent face vof the temple head 11, such engagement talingrplace at either one or the other of the limits of the pivotal a movement. It should be noted that the upper part of the pivot block 8 is provided with a forwardly extending arm at the outer side of the lower end of the temple arm 6 and that this .arm on the pivot block carries an iny wardly directed screw 19 having an outer head `providing for its manipulation for thereby, to the desired extent, positively forcing the temple 7 inward towards the other temple 7 `by the engagement of the inner end of this screw with the temple arm 6.

It is to be noted that each of the temples7 is of `rounded trough shape or substantially ofa U shape in cross section with its smooth rounded side directed inward towards the othertemple to 4come in contact with the head ofthe :patient and thus contribute a feeling of comfort, whereas heretofore commonly the temples of trial ,frames have had sharp edges along V.the inner sides which gave a feeling thatl they cut into the skin. Thel temples 7 are properly resilient and together with the somewhat stiff resiliency of the temple arms @cause the trial frame to cling firmly to the heard when the temple clamp screws 19 are properly adjusted.

lnFigs. 13 and 14 there is shown a somewhat modified construction of the horizontal pivotal connection of the temple 7 to the temple arm 6, the vertical pivotal connection remaining the same as above described. 1n this construction amodilied pivot bloclr 2O has acup portionof suhicient depth'to receive completely therein a slightly modified flat head 21 of thev temple 7. Adjacent the bottom ofthe cup a spur gear 22 is secured to the temple head 21, for example, byA means of screws as shown, and ahorizontal pivot studm23 for the temple 7 passes inwardly through the bottoniof the cup and through the gear 22 and the temple head 21.

Angular tilting movement Vof the temple arni on the temple 7 is limited by means of cooperating stops provided b v the temple itself and a peripheral slot 24 in the cup of thepivot block 2O through whichthe temple 7 projects. A lplate 25 engages the rim of the pivot block cup and retains the temple head21 in place, this plate and the pivot studV 23 being retained in place by means of a screw 26 entering the adjacent end of the pivot stud 28, which enters but does not pass all of the way through the plate 25 and is shown as somewhat reduced in diameter back to a point within the temple head 21. By reason of theV fact that the retaining plate 25 is somewhat yieldable and resilient, adjustment of the clamp screw 26 will cause the temple head 21 and its gear to be gripped with more or less friction between the face of the plate 26 and that of the bottom of the cup on the pivot block 20, this arrangement thus forming a friction device in control of the rocking movement of the temple arm (3 for retaining the latter in any position of angular adjustment between the` limiting stops provided by the slot 2ll and the temple 7. ln order to facilitate and accurately accom lish this annular ad'ustment a small pinion 27V within the box or cup formed by the pivot blocl: 2O engages the gear 22 and has a stem j ournaled in the pivot bloc i, this stem having lined thereto a linger knob 28 at the outer side of the pivot block.

A suitable nose pad 29 is freely pivoted on a horizontal transverse pivot to the lower end ofa. nose bar 30 arranged in a vertical plane transverse to the main frame bar or channel bar 1 and extending downward from the latter at the front thereof. The nose bar 30 may slide longitudinally for vertical adjustment through a long guideway provided in the front of a. pivoted guide blocl-r or pivot block 31 kwhich at its rear is pivoted beneath the cross bar 1 on a horizontal transverse pivot between a pair of lugs provided on the lower end' of the center block or anchor block 3, thereby to provide for forward and backward adjustment of the nose pad 29. The nose pad 29 may be rapidly adjusted up and down and securely held at any position of such adjustment by means of a quick acting or long pitch screw 32 which is journaled through the'rearwardly turned upper end of the nose bar 30 and is threaded through the body of the pivot block 31. In the construction shown in the drawings this screw 32 is a double-thread screw. The extent of the pitch and the coarseness of the thread of this screw have been somewhat exaggerated for drafting reasons. It will be noted that the body of the pivot block 31 is of suliicient thickness to provide a long screw thread bearing for `the screw 32, thereby assuring long wear and consequent accuracy of adjustment, most desirably the screw 32 being made of steel while the pivot blc-.ch 31 is of duralumin. rllhe upper end portion of the adjusting screw 32 is reduced to form a bearing shoulder below the rearwardly turned lupper end of the nose bar 30 andis Voutwardly screw threaded to receive small nut 33 which forms a bearingshoul- Y der above the nose bar. A small finger knob 34 screws upon theY upper end of the adjusting screw 32 and forms' a am nut or lock nut for the shoulder nut 33 and isitself thus frictionally locked thereby.Y The horizontal pivot of the nose bar l on the cross bar 1 is a friction pivot for frictionally retaining the nose bar in any position of angular adjustment for thus maintaining the nose pad 29 at different positions of forward and backward adjustment. `A steelpivot pin 35 which is parallel tothe cross bar lnextends between and is fixed in the lugs of the center block 3 and is locked in place therein by means of a set screw 36 whichsc-rews into one ofthese lugs from the rear, as is shown in Figs. 3 and 1 4. The rear endof the nose barl pivot block 31 has a friction split clamp bearing between the pivot block lugs on `the pivot pin 35 andthe amount of friction desired in this bearing maybe adjusted bymeans of'a clamp screw 37, as shown inFigs. 3, '4 and 5,7for thereby frictionally retaining the nose bar30 in angularly adjusted position accordingto the particular forward" or backward position desired for the nose pad 29.

" Rigid stainless steel hangerarms 38, shown as in the formV of fiat strips, rigidly depending'fromthe lcross bar l'intermediate of its ends, at opposite sides'of the center block 3,

` rigidly carry the trial case` lens holders. Each of the depending arms 38 is odset rearwardly at two places, once on transverse lines adja- K cent the cross bar 1, and again on diagonal lines at a lower point adjacent the top of the lens holder, thereby for bringing the lens holders tothe proper distance from the eyes,

at'the rear of the cross bar 1. Each of theseV depending arms38 is circularly curved outwardly and upwardly in J shape toprovide a substantially semicircular lower'end portion' 39 which forms a part of the lens holder in one piece with the arm 38. v Each of these semicircular lower arm portions 39 is provided with a plurality-of lens cells. Y

in the construction shown, an arcuateV rear lens cell 40, open at the top 'and VshownV asV terminating upwardly somewhat short of the semicircular portion ,39, particularly at the inner side thereof,"is removably secured, as by means of screws, to the rear of the semiycircular plateformed by the curved arm portionV 39.` rlllwo lens cells are shown as pro.-

vided at the front `of the semicircular arm portion .39. In the construction shown, an

Y outwardly graduatedor calibrated plate 41,

which extends upwardly at its inner end so als to be somewhatmorethan semicircular,

is'held in forwardlyfspaced relation to the rear plate v39 by means of a pair of notched kspacers 42 adjacentthe upper ends ofthe front plate 41.' Adjacent the bottomV of thisr cell a peripherally grooved wheel 437extends into the cell between the front andrear plates i 41y and 39 and is fixed upon a shaft 44'jour-v naled in downward extensions of these plates. This shaft 44 is extended forwardly through a bearing sleeve 45 carried by the front platel 41v and at its forward end has fixed thereon a small finger knob 46`for rotating the wheel k43. The lens in *the vlens cell betweenvthe spacers 42 rests with Aits weight upon the wheel 43 within the peripheral groove thereof and may be rotated thereby for axially adjusting the lens and such adjustment may be quickly effected byjreason of the fact thatthe lens-adjusting wheel 43 is'of considerably larger diameter ythan the finger knob 46. A front lens cellis provided at the front of .the calibratedl plate 41 by means ofthreeiforwardlyv projecting notched studs `47, the

. upper twoof which are in alignment with the spacers 42 and may be supported by the same screws which hold these spacers. It ywill be noted that'the depending arms 38 are amply strong for rigidly supporting the trial case lens holders together with the lenses carried thereby in the ,lenscells thereof and that these arms'are Vsubjected to nov other strains, in view Vof the fact that thetemples 7 havehno attachment to or connection with either the arms 38 or the lens holders thereon. Y

VAt each side of thecenter blocki'3 a slide bloclr 48 closely fits in the slideway provided.

within the tubular bar formed the channel bar 1 and its rear plate 5 and at its front side projects downwardly through andis furtherV guided in the slot 2 formed between the front ledge of the lower cut-away flange of l.the

channel bar 1v and the'inner side of the lower edge portion of the rear'plate 5, as shown in Figs. 4 and 6. The upper end portion of the depending varm 38 extends upwardly through the slot 2 to the upper flange of the channelba'r 1, overlapping upon andfbeing countersunk intothe front of the slide block 48 flushl with they front face Athereof and is firmly secured theretobymeans of screws, as shown in Figs."4l and 6. .One of these yscrews extends forward' in the; form of aV stud-49j ust below the channel bar 1 substantially flush with the front face thereof and forms an vindex to cooperate Vwith a scale shown in Fig. 1 aspro'vided on the front face of this .bar 1, these markers 49 cooperating with the scale to indicate the pupillary ,distance of theV lens holders, that is, in each Vinstance the distance from a median vertical ico other in overlapping relation they are vertically odset from oneanother, the guide bar 50 appearing in Fig. 6 and at the left in Fig. 4 being carried by the upper part of its slide block 4S, whilel the other guide bar 50, appearing right in Fig. 4, is carried by the lower part of the other slide block 48. These guide bars 5f) lie flat against the inner taceef the web' of the channel bar l, and the center block 3 in its rear 'fa ce is provided with upper and lower tran sversev slots which snugly butslidably receive `-the guide bars 50 and form a slideway therefor, as shown most clearly in Fig. 5. Also each ot' the slide blocks 48 is provided with a similar transverse slot forming a4 guideway `for guiding the adjacent end portion of the guide bar 50 carried by the other slide block, one of these guide slots bei/ng shown in Fig. 6 in the rear 'tace of the lower part of the slide block, while the guide slot of the other slide block is in the upper part of its rear tace, as will be readily? understood. f By reason of this construction and arrangement the guidebars 50 `will at all times be guided `adjacent to their treer ends, thereby making such guiding most effective in preventing the possibility ot any angularmovement in any directionof the slide blocks 48V and whereby precise alignnient of th-e axes of the lenses carried by the lens holders is obtained.` It will be noted of the construction shown that in the wider adjustments of the pupillaryV distance between the trial case lens holders,l in which the slide blocks 48 are more widely separated, the guide bars 50 will be effectively guided by the middle guide fblock or center block 3, while iii-the near pupillary adjust-ments of the slide blocks 4 in which the guiding effect 'of the center block' 3 might not be so effective, each of the slide blocks 48 will then efiectively f guide the :adjacent free end portion ofthe guidebar whi h projects from the other slide i block, this latter guiding effect beginning to take place at about a'iniddle point-of adjustment of the slide blocks 48 alongl thecress bar l and continuingthroughout any fur- .ther inward adjustment of the slide blocks y 48.n This manner of guiding the slide blocks Y y each eye and thereforeseparate or individual 48 by means of the Vguide bars 50 provides a smooth and `free sliding movement of these blocks and eliminates the usual detect in tr'ial frames of the inability of maintaining a'precise alignmentof the `axes of the lenses. The pupillary adj ustment' is individual for means areV providedwfor effecting and maintaining such adjustment of the .trial case lens holders. Suche means will befirst described with reference to the trial case lens holder and `its slide'block 48 for the right eye, which inthe drawings appears at the lleft in Figs. land-2 and at the right in Fig. 4, which is a rear view clearly showing the operating parts new `to be described. the construction shown 'an adjusting screw 51 parallel with the slideway provided in the tubular cross bar, formed by the channel bar l and its closure plate 5j is screw threaded through the slide block 48 within this tubular cross bar and extends at its free inner end to a point adjacent the center block 3. rlhis `screw 5l has a. somewhat reduced outer shaft portion 52 journaled in the end block 4, which provides a long bearing therefor through a tubular reduced y(mtwzncl extension or neck formed on the end block 4. AThe screw 52 is provided with a smooth shoulder-forming portion 53 which is countersunk into a shoulder-torming enlargement in the inner end of the end block 4 and prevents outward movement of lhis screw. Outward from the shaft portion 52 of the screw 5l is a. squared portion `54 the largest or diagonal diameter of which is the same as that of the shaft portion 52 and which thus forms a series of four outwardly directed shoulders flush with the end of the tubular neck on the end block 4. Outward from this square portion 54 the screw 5l terminates in a reduced screw threaded end portion 55. A knurled finger knob 56 is shown as of cylindrical cup shape and as provided with a tubular inwardly entending'neck portion, the bore of the'la-rger outward part of which is the same as that of the shaft portion 52 of the screw 5l, this bore extending entirely through linger knob 56 and at its extreme inner endbeing reduced in diameter on four sides -to form a square socket portion to receive the square .portion V54 of the screw 5l, as is shown in Fig. l2. An internally screw threaded stud 57 screws over the reduced screw threaded end 55 of the screw 51 and by vreason ofthe abutment of its inner end withthe offsets or` shoulders formed in the neck of the finger knob 56 where the bore in the finger knob is squared, as above described, is thereby effective to retain the'finger knob 56 on the outer end of the screw 5l, the inner end of the tubular neck of the finger knob abutting against the outer end of the tubular neck on the end block 47 thereby to prevent any inward movement of the screw 51,as is shown in Fig. 4.

The screw 5l is a long pitch or quick acting screw fior thereby effecting a rapid pupillary adjustment of the trial case lens holder carried by the depending arm 38, which is fixed vto the adjustable slide block 48'. The pitch .of the thread of this screw A51 vis made such as securely. to maintain the slide block 48 in adjusted position.v The screw lhas a left hand thread and in :the construction shown in the drawings this is a double-thread screw, of which both the pitch and the coarseness ofthe thread have been somewhat eX- aggerated for drafting reasons.

The construction and operation of the means forefiectingand maintaining the adcarriesthe trialicase lens holder for the left eyeare the same as that described for the right'eye with the exception that an adjusting screw 58 having a right hand threadk is provided. The reason 'for the left 'hand thread of the screw 51 and` the'right hand thread of the screw'58is for the convenience of the operator in turning the respective nger knobs 56. If Vreference will be had to the front view of Fig. 1 it will be noted that the'linqer knob 56 there appearing at the left hand side and which rotates the screw 51 having.; the left hand thread, may be-most conveniently rota-'ted with the left hand of the operator,- while the Yfinger knob 56 at the right side of Fig. l, for rotating the screw 58 having' the'right hand thread, be most conveniently rotated by the right hand'of the.

operator.v yThe construction and arrangement above described have been found to Ybe the-most convenient to the operator in mali; ing adjustments. VIt will be noted that the "screws 5 1 andc58 have long bearings in the slide blocks48 and in'theend blocks 4. These screws may desirably be blocks /lSlof brass.` i :v It is'believed that the operation and manner-of use have already been fully described along with the description of vthe construction and that nothing more remains to be added in that respect.'V Y

It is obvious thatfvarious:modifications may be made in the embodiment of the inven- 0 arms rigidly 4dependimg from the Gross barr to side toY form a main frame part, gradually tapering stili'ly resilient curved temple arms rigidly connccted'at their larger inner ends to the outer ends of the cross bar and eX- tending therefrom on gradually merging curved linesoutwardly and. rearwardly and downwardly in substantial conformation with the shape ofthe head, a' temple connected to P the outer. end of each of said arms, and a pair of trial case lens holders below and carried by said cross bar independently of said temple arms. 1 Y A 2. A trial frame having, in combination, a

' straight rigid cross bar forming a main frame part, lcurved gradually tapering stifly resilient temple armsof trough yshape incross section rigidlyV connected at their larger inner ends tothe respective outer ends of the cross bar andextending therefrom on gradually-V merging curvedlinesr outwardly and rearwardly and downwardly in substantialv conformation with the. shape of the head.'

resilient temples connected respectively to the outer ends of the temple' arms, a pair of hanger of steel and the slide intermediate of its ends in laterally spaced relation, anda pair of trial frame lensholders rigidly carriedfby'said hanger arms.

c 3. The invention defined in claim 2 in which each of said templesis of, rounded trough shape in cross section withits rounded side directed inwardly towards the other temple and thus towards the head of the patient to provide a smooth surface lin contact therewith. Y Y

4:. A trial frame having a pairof temples each ofv which vis .of rounded trough shape in cross section with its rounded side-*directed inwardly towards the kother temple and thus towards the head of the patient toprovide a smooth surface in contacttherewith.

5. A trial frame having, in combination, a straight rigid cross barextending yfrom side yto sideto form a main frame part, curved temple arms rigidly connected at their inner ends' to the outer ends lof the cross bar and extending therefrom outwardly vand rearwardly and downwardly, a temple connected to the outer end ofeach of said arms, a pair of trial frame lens holders below and carried zontal pivot, a vscrew cooperating with the vertical pivot for positively forcing the temple inward towards .the other temple, co-

operating stops for positively limiting the relative angular movement of the temple arm and temple onthe horizontal pivot, andan automatically-releasing spring detent device for yieldingly holding thetemple arm at each of its limits of angular movement relatively to the temple, said detent device comprising a spring disc interposed between adjacent faces of the pivoted partsv and anchored to one of said parts, said disc and the other said part having a yieldable intereniba gaging relation by means of a recess provided in one and a projection-provided on the other to engage inthe recess for yieldably arts.

6. A trial frame having, in combination, a

straight, rigid cross bar extending fromside tol side to form a main frame part, curved *temple arms rigidlyconnected at their-inner ends tothe outer ends of the cross bar and extending therefrom outwardly and' rearwardly and downwardly, atemple connected to the outer end of each of said arms, a pair of trial case lens holders below and Vcarried by said cross bar independently of said temple arms, a pivot piece forming a connection between a temple and a temple arm and providing a vertical pivoty and a transverse horizontal pivot, a screw cooperatingwith the vertical pivot for positively forcing the temple inward towards the other temple, cooperating stops for positively limiting the relmaintaining the pivotalV adjustment of said Illia' ative angular movementjof the temple arm and teiiiple `on the horiZ'ontal pivot, and an automatically-relejasing 'Spring detent device lfor yieldably holding 'the temple arm'at each of its limits of angular movement relatively to the'temple, l,said detent device comprising a; spring disc interposed between adjacent faces fof the 'pivoted parts and anchored to one of said'rparts and having a substantially V-shaped Vdi'ai'netral ridge, the other said part having 'therein a pair of diiainetral crossed grooves in either of which the V- shap'edridge of the spring disc may :engage at one or the other of the limits of the piv- Ot'a'l movement. v

` 7. In a trial frame, in combination, a temple, a frame part, and means for connecting the temple to the frame part including a substantially horizontal pivotal connection comprising cooperating stops for positively limiting the relative angular movement of the frame part on the temple, and an automatically-releasing spring detent device for yieldably holding said frame part at each of its limits of angular movement relatively to the temple, said detent device comprising a spring disc interposed between adjacent faces of the pivoted parts and anchored to one of said parts, said disc and the other said part having a yieldable interengaging relation by means of a recess provided in one and a projection provided on the other to engage in the recess for yieldably maintaining theV pivotal adjustment of said parts.

8. In a trial frame, in combination, a temple, a frame part, and means for connecting the temple to the frame part including a substantially horizontal pivotal connection comprising cooperating stops for positively limiting the relative angular movement of the frame part on the temple, and an automatical-` ly-releasing spring detent device for yieldably holding said frame part at each of its limits of angular movement relatively to the temple, said detent device comprising a spring disc interposed between adjacent faces of the pivoted parts and anchored to one of said parts and having a substantially V-shaped diametral ridge, the other said part having therein a pair of diametral crossed grooves in either of which the V-shapedridge ofthe spring disc may engage at one or the other of the limits of the pivotal movement.

9. In a trial frame, in combination, a

`straight rigid cross bar of channel shape forming a main frame part, a cover strip for the channel extending along the full length of and lirmly secured to the cross bar to form in eflect a part thereof, a pair of temple arms formed in one piece with the cover strip as end extensions therefrom so as to form therewith a one piece temple yoke, and temples connected to the outer ends of the temple arms.

10. In a trial frame, in combination, a cross pi'ece in the form of a straight strip, a pair of temple arms formed in one piece of material with the cross ,piece and extending as end continuations thereof on curved lines outwardly and rearwardly and downwardly, such temple arms being of trough shape in cross section and gradually tapering outwardly so as to be stiflly resilient, resilient temples connected to the lower ends of the temple arms, a straight rigid cross bar forming a main frame part firmly secured to the cross piece, a nose bar mounted on the main frame part, and a pair of trial case lens holders below 'and carried by the main frame part.

ll. A trial frame having, in combination, a straight rigid cross bar yof channel shape forming a main frame part and having one of its flange'scut away to provide a longitudinal slot, a plate in the form of a strip firmly secured to the cross bar to close the channel with the exception of said slot and forming Nwith said channel-shaped cross bar a tubular longitudinally slotted cross bar, an anchor block firmly secured in said tubular cross bar at the middle of its length and projecting to the outside thereof through said slot, a nose bar connected to the anchor block, a

'pair of slide blocks respectively 'at opposite sides of the anchor block within the tubular cross bar slidable longitudinally thereof and held thereby against angular movement in any direction, a pair of depending arms respectively having at their upper ends aV rigid' connection' through said slot to the respective slide blocks, and a pair of trial case lens holders respectively rigidly connected to the lower ends of the depending arms. j

12. The invention delined in claim 1l in ycor'nbination with temple arms formed in one piece Vwith and as outward continuations from said channel-closing plate or strip, and temples connected to the 'outer ends of the temple arms. v

13,. Ina trial frame, in combination, a 'channel-shaped cross bar having upper and lower flanges and with its lower langecut away to' form a longitudinal slot, a cover plate closing the channel of the cross bar with the exception of said slot and firmly secured thereto lto form a reinforcement therefor and :forming therewith a tubular bar, a guide lblock Vfirmly secured in place in ythe channel "ofthe cross bar at the middle of the latter, slide blocks gi'iidedl in the channel ofthe cross bar for sliding movement longitudinally thereof at opposite sides of the guide block respectively, vdepending arms respectively rigidly carried'b'y the slide blocks, trial case lens holders respectively rigidly carried by 4the lower ends of said arms, and guide bars ,guided by 'the guide block and respectively rigidly 'carried by the slide blocks to slide therewith.

14. In a trial. frame, in combinatiom-a bar projectingirigidly inwardly from tlieupchannel-,shapedY cross bar having upper and lower anges andwith its lower lange out laway to form a longitudinal slot, a cover Vplate closing'the channel'of the cross bar with the exception of said slot and firmly secured thereto to form a reinforcement therefor and forming therewith a tubular bar, a guide block iirmly-secured in place in the channel of the cross bar at the mid- .dle of the latter, slide yblocks guided in the channel of the cross ,.ba r for sliding moVeper end portion of veac-h of said arms in p'aralf lelv overlappingfrelation with ythe other guide bar and guided forsubstantially horizontal parallel sliding movement onthe main frame part lto partake of the'slidingmovement of said'arms for thereby maintaining the axial alignment of the lensholders, the upperend of each of said arms being provided with a guideway for guiding the adjacent'end porc tionof the guide bar which projects from the other arm.y Y A In. witness whereof, I hereunto subscribe my signature@ Y 'HANS respectively rigidly'carried by the slide blocks i to slide therewith, each of the slide blocks Y being provided Vwith a guideway for guiding vthe adjacent'end p'ortionof the guide bar carried bythe other slide block.

15., A trial frame having, in combination, a channel-shapedcross bar forming a main frame ypart andhaving upper and lower ianges of which the lower iiange is cut away Y I to form a longitudinalslot, ananchor block iirmly secured inl place in the, channel at the middle of the length of the cross bar,l end blocks iirmly secured tothecross bar and closing the ends ofy its channel,'sl ide blocks respectively guided inthe channel at oppo.-

site sides of the anchor block to slide longif tudin'allyV ofthe cross bar, depending arms respectively rigidly carried by the slide blocks c bymeans of a connection' thereto through said 1 c longitudinal slot, trial case lens holders rigf idly carried by the lower ends of said arms,

a nose'bar carried by the anchor block and {havinga connection thereto through said lon- Y i gitudinal slot,fguide bars guided by the anv Chor block and respectively rigidly carried bythe slide blocks, a cover plate closing the channel in the cross bar and firmly secured thereto to form a reinforcement'f thereof, I

extensions thereofoutwardly and rearwardly and downwardly on curved lines, andtemples connected to the outer ends of the'temple arms. Y

16. VIn atrial frame, in combination, amain iframev part, apair of laterally spaced .de-

'pending arms guided at their upper ends vfor substantiallyhorizontal sliding movement on the main frame part, a pair of trial case lens holders one of which is carried by the ylower end portion of each of said arms, and a guide 

